//
//  WBNewFeature.swift
//  微博
//
//  Created by 康智桐 on 2018/4/22.
//  Copyright © 2018年 Kk. All rights reserved.
//

import UIKit


//新特性视图
class WBNewFeature: UIView {
    
    
    
    @IBOutlet weak var scrollView: UIScrollView!
    
    @IBOutlet weak var enterButton: UIButton!
    
    @IBOutlet weak var pageControl: UIPageControl!
    
    
    //进入微博
    @IBAction func enterStatus() {
        removeFromSuperview()
        
    }
    
    

    
    class func newFeatureView()->WBNewFeature{
        
        let nib = UINib(nibName: "WBNewFeature", bundle: nil)
        
        let v = nib.instantiate(withOwner: nil, options: nil)[0] as! WBNewFeature
        
        v.frame = UIScreen.main.bounds
        
        
        return v
        
    }
    
    override func awakeFromNib() {
        
        //添加四个视图
        let count = 4
        let rect = UIScreen.main.bounds
        
        for i in 0..<count {
            
            let imageName = "new_feature_\(i + 1)"
            let iv = UIImageView(image: UIImage(named: imageName))
            
            iv.frame = rect.offsetBy(dx: CGFloat(i) * rect.width, dy: 0)
            
            scrollView.addSubview(iv)
        }
        
        //制定scrollview 的属性
        scrollView.contentSize = CGSize(width: CGFloat(count + 1) * rect.width, height: rect.height)
        scrollView.bounces = false
        scrollView.isPagingEnabled = true
        scrollView.showsVerticalScrollIndicator = false
        scrollView.showsHorizontalScrollIndicator = false
        
        scrollView.delegate = self
        
        
        
        //影藏按钮
        enterButton.isHidden = true
        
        
    }
}


extension WBNewFeature:UIScrollViewDelegate {
    
    
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        
        //滚动到最后一屏 让视图删除
        let page = Int( scrollView.contentOffset.x / scrollView.bounds.width)
        
        //判断是否是最后一页
        if page == scrollView.subviews.count {
            print("热烈欢迎！")
            removeFromSuperview()
            
        }
        
        //如果是倒数第二页显示按钮
         enterButton.isHidden = ( page != scrollView.subviews.count - 1)
            
        
        
        
        
    }
    
    
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        //一旦滚动 隐藏按钮
         enterButton.isHidden = true
        
        //计算偏移量
        let page = Int(scrollView.contentOffset.x / scrollView.bounds.width + 0.5)
        
        //设置分页控件
        pageControl.currentPage = page
        
        //分页控件的隐藏
        pageControl.isHidden = (page == scrollView.subviews.count)
        
    }
    
    
    
}

